Mashable reached out to Apple and local police, who still don't know who is responsible or what they are using to target the buses.

The commuter buses had windows shattered by an unknown object, possibly a rock or a pellet gun.

At least five Apple buses and one Google bus were targeted on Friday and Tuesday, according to reports.

Apple's decision to build a data center in Reno in 2012 kickstarted a wave of big-name tech projects coming to the Reno area, as well as a new approach to economic development.

Buses carrying Apple and Google employees were attacked during the week in San Fransico. There have been four reports at least regarding broken windows on January 16 and January 12.

Subject: Coaches temporarily being reroutedDue to recent incidents of broken windows along the commute route, specifically on highway 280, we're re-routing coaches for the time being. The route change "could mean an additional 30 to 40 minutes of commute time in each direction for some riders", the email explained.

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"There is nothing confirmed but it is suspected that a pellet gun might have been used in these incidents", Apple said in an internal email sent to all employees that was seen by The Guardian.

These shuttle buses have been targeted with vandalism before. The safety of their employees is their first priority as they are working closely with law enforcement to examine these incidents and they will notify their employees as soon as the coaches will be returned to regular route, as said by the company.

Why are the buses being attacked?

Demonstrators in 2013 and 2014 blocked and damaged buses to protest the booming tech industry's impact on affordable housing and the gentrification of San Francisco.

Apple and Google have yet to respond to NBC Bay Area's request for comment.

Interestingly, the buses involved in this latest incident don't include branding indicating they come from a major tech corporation.

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